Overview
The “Shaft current protection” function detects shaft currents of a generator via special shaft-current transformer. It prevents the damage of the bearings due to a current flow to ground, and allows a flexible evolution of the shaft current with different measuring principles.
For more detailed information on “Shaft current protection” function, refer to SIPROTEC 5 devices, V8.30 & higher manuals.
To see other supported functions, click here.
Structure/Embedding of the Function
Setting Parameters
Setting parameters for Shaft current protection
| Addr. | Parameter | C | Setting Options | Default Setting |
| Stage 1 | ||||
| _:17251:1 | Stage 1:Mode | off on test |
off | |
| _:17251:2 | Stage 1:Operate & flt.rec. blocked | no yes |
no | |
| _:17251:3 | Stage 1:Threshold | 0.30 mA to 1600.00 mA | 5.00 mA | |
| _:17251:4 | Stage 1:Dropout ratio | 0.80 to 0.95 | 0.90 | |
| _:17251:6 | Stage 1:Operate delay | 0.00 s to 60.00 s | 3.00 s | |
| _:17251:7 | Stage 1:Dropout delay | 0.00 s to 60.00 s | 0.00 s | |
| _:17251:8 | Stage 1:Method of measurement | fundamental comp. 3rd harmonic 1st and 3rd harmonic |
fundamental comp. | |
Logic Diagrams & highlights
Connection of the Shaft-Current Transformer (Possible Current Flow in the Event of a Fault)
Terminals of the Shaft-Current Transformer
Filter options
Logic Diagram of the General Functionality
Logic Diagram of the Stage Shaft-Current Protection
